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SubjectRe: [PATCH v10 12/12] drivers/block/pmem: Map NVDIMM with ioremap_wt()

* Andy Lutomirski <luto@amacapital.net> wrote:

> You answered the wrong question. :) I understand the point of the non-temporal
> stores -- I don't understand the point of using non-temporal stores to *WB
> memory*. I think we should be okay with having the kernel mapping use WT
> instead.

WB memory is write-through, but they are still fully cached for reads.

So non-temporal instructions influence how the CPU will allocate (or not allocate)
WT cache lines.

Thanks,

Ingo


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